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液体界面上的具有相似电荷的粒子之间的电场诱导的毛细管吸引力

M G Nikolaides¹, A R Bausch, M F Hsu

¹Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

|November 26, 2002

概括

接口上的带电的体粒子可以由于毛细管力而相互吸引. 这些力源于由粒子自身的静电场引起的接口变形,使得可控制的粒子排序成为可能.

科学领域:

体和接口科学科学
软物质物理学软物质物理学
静电学静电学静电学

背景情况:

接口上的带电粒子通常由排斥性库伦相互作用稳定.
在接口处的非极相导致双极排斥,可能导致在限制下进行排序.
观察到的无限制的粒子排序表明有吸引力的相互作用存在.

研究的目的:

量化测量油水界面上的合颗粒之间的吸引力相互作用.
在没有区域限制的情况下解释吸引力相互作用的起源.
探索这些有吸引力的相互作用的可控性.

主要方法:

量化测量油水界面的粒子间力.
对界面形状扭曲的分析.
对静电应力和毛细血管力进行建模.

主要成果:

在油水界面上测量了具有相似电荷的合粒子之间的吸引相互作用.
这些吸引力是由源自接口变形的毛细血管力解释的.
接口变形是由来自粒子双极场的静电应力引起的.

结论:

这项研究提供了在接口上充电的体粒子之间的吸引力相互作用的定量解释.
来自二极场的静电应力诱导接口变形,导致毛细血管的吸引.
可以通过调整界面流体的极性来控制粒子间的吸引力.

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